Atmospheric test of the J(BrONO 2 )/ k BrO+NO 2 ratio: implications for total stratospheric Br y and bromine-mediated ozone loss
We report on time-dependent O 3 , NO 2 and BrO profiles measured by limb observations of scattered skylight in the stratosphere over Kiruna (67.9° N, 22.1° E) on 7 and 8 September 2009 during the autumn circulation turn-over. The observations are complemented by simultaneous direct solar occultation...
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ftdoajarticles:oai:doaj.org/article:6580e08a26dd4403b332e1986dd01ac7 2023-05-15T17:04:22+02:00 Atmospheric test of the J(BrONO 2 )/ k BrO+NO 2 ratio: implications for total stratospheric Br y and bromine-mediated ozone loss S. Kreycy C. Camy-Peyret M. P. Chipperfield M. Dorf W. Feng R. Hossaini L. Kritten B. Werner K. Pfeilsticker 2013-07-01T00:00:00Z https://doi.org/10.5194/acp-13-6263-2013 https://doaj.org/article/6580e08a26dd4403b332e1986dd01ac7 EN eng Copernicus Publications http://www.atmos-chem-phys.net/13/6263/2013/acp-13-6263-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-13-6263-2013 1680-7316 1680-7324 https://doaj.org/article/6580e08a26dd4403b332e1986dd01ac7 Atmospheric Chemistry and Physics, Vol 13, Iss 13, Pp 6263-6274 (2013) Physics QC1-999 Chemistry QD1-999 article 2013 ftdoajarticles https://doi.org/10.5194/acp-13-6263-2013 2022-12-31T14:59:51Z We report on time-dependent O 3 , NO 2 and BrO profiles measured by limb observations of scattered skylight in the stratosphere over Kiruna (67.9° N, 22.1° E) on 7 and 8 September 2009 during the autumn circulation turn-over. The observations are complemented by simultaneous direct solar occultation measurements around sunset and sunrise performed aboard the same stratospheric balloon payload. Supporting radiative transfer and photochemical modelling indicate that the measurements can be used to constrain the ratio J(BrONO 2 )/ k BrO+NO 2 , for which at T = 220 ± 5 K an overall 1.7 (+0.4 −0.2) larger ratio is found than recommended by the most recent Jet Propulsion Laboratory (JPL) compilation (Sander et al., 2011). Sensitivity studies reveal the major reasons are likely to be (1) a larger BrONO 2 absorption cross-section σ BrONO 2 , primarily for wavelengths larger than 300 nm, and (2) a smaller k BrO+NO 2 at 220 K than given by Sander et al. (2011). Other factors, e.g. the actinic flux and quantum yield for the dissociation of BrONO 2 , can be ruled out. The observations also have consequences for total inorganic stratospheric bromine (Br y ) estimated from stratospheric BrO measurements at high NO x loadings, since the ratio J(BrONO 2 )/ k BrO+NO 2 largely determines the stratospheric BrO/Br y ratio during daylight. Using the revised J(BrONO 2 )/ k BrO+NO 2 ratio, total stratospheric Br y is likely to be 1.4 ppt smaller than previously estimated from BrO profile measurements at high NO x loadings. This would bring estimates of Br y inferred from organic source gas measurements (e.g. CH 3 Br, the halons, CH 2 Br 2 , CHBr 3 , etc.) into closer agreement with estimates based on BrO observations (inorganic method). The consequences for stratospheric ozone due to the revised J(BrONO 2 )/ k BrO+NO 2 ratio are small (maximum −0.8%), since at high NO x (for which most Br y assessments are made) the enhanced ozone loss by overestimating Br y is compensated for by the suppressed ozone loss due to the underestimation of ... Article in Journal/Newspaper Kiruna Directory of Open Access Journals: DOAJ Articles Kiruna Atmospheric Chemistry and Physics 13 13 6263 6274 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Physics QC1-999 Chemistry QD1-999 |
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Physics QC1-999 Chemistry QD1-999 S. Kreycy C. Camy-Peyret M. P. Chipperfield M. Dorf W. Feng R. Hossaini L. Kritten B. Werner K. Pfeilsticker Atmospheric test of the J(BrONO 2 )/ k BrO+NO 2 ratio: implications for total stratospheric Br y and bromine-mediated ozone loss |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
We report on time-dependent O 3 , NO 2 and BrO profiles measured by limb observations of scattered skylight in the stratosphere over Kiruna (67.9° N, 22.1° E) on 7 and 8 September 2009 during the autumn circulation turn-over. The observations are complemented by simultaneous direct solar occultation measurements around sunset and sunrise performed aboard the same stratospheric balloon payload. Supporting radiative transfer and photochemical modelling indicate that the measurements can be used to constrain the ratio J(BrONO 2 )/ k BrO+NO 2 , for which at T = 220 ± 5 K an overall 1.7 (+0.4 −0.2) larger ratio is found than recommended by the most recent Jet Propulsion Laboratory (JPL) compilation (Sander et al., 2011). Sensitivity studies reveal the major reasons are likely to be (1) a larger BrONO 2 absorption cross-section σ BrONO 2 , primarily for wavelengths larger than 300 nm, and (2) a smaller k BrO+NO 2 at 220 K than given by Sander et al. (2011). Other factors, e.g. the actinic flux and quantum yield for the dissociation of BrONO 2 , can be ruled out. The observations also have consequences for total inorganic stratospheric bromine (Br y ) estimated from stratospheric BrO measurements at high NO x loadings, since the ratio J(BrONO 2 )/ k BrO+NO 2 largely determines the stratospheric BrO/Br y ratio during daylight. Using the revised J(BrONO 2 )/ k BrO+NO 2 ratio, total stratospheric Br y is likely to be 1.4 ppt smaller than previously estimated from BrO profile measurements at high NO x loadings. This would bring estimates of Br y inferred from organic source gas measurements (e.g. CH 3 Br, the halons, CH 2 Br 2 , CHBr 3 , etc.) into closer agreement with estimates based on BrO observations (inorganic method). The consequences for stratospheric ozone due to the revised J(BrONO 2 )/ k BrO+NO 2 ratio are small (maximum −0.8%), since at high NO x (for which most Br y assessments are made) the enhanced ozone loss by overestimating Br y is compensated for by the suppressed ozone loss due to the underestimation of ... |
format |
Article in Journal/Newspaper |
author |
S. Kreycy C. Camy-Peyret M. P. Chipperfield M. Dorf W. Feng R. Hossaini L. Kritten B. Werner K. Pfeilsticker |
author_facet |
S. Kreycy C. Camy-Peyret M. P. Chipperfield M. Dorf W. Feng R. Hossaini L. Kritten B. Werner K. Pfeilsticker |
author_sort |
S. Kreycy |
title |
Atmospheric test of the J(BrONO 2 )/ k BrO+NO 2 ratio: implications for total stratospheric Br y and bromine-mediated ozone loss |
title_short |
Atmospheric test of the J(BrONO 2 )/ k BrO+NO 2 ratio: implications for total stratospheric Br y and bromine-mediated ozone loss |
title_full |
Atmospheric test of the J(BrONO 2 )/ k BrO+NO 2 ratio: implications for total stratospheric Br y and bromine-mediated ozone loss |
title_fullStr |
Atmospheric test of the J(BrONO 2 )/ k BrO+NO 2 ratio: implications for total stratospheric Br y and bromine-mediated ozone loss |
title_full_unstemmed |
Atmospheric test of the J(BrONO 2 )/ k BrO+NO 2 ratio: implications for total stratospheric Br y and bromine-mediated ozone loss |
title_sort |
atmospheric test of the j(brono 2 )/ k bro+no 2 ratio: implications for total stratospheric br y and bromine-mediated ozone loss |
publisher |
Copernicus Publications |
publishDate |
2013 |
url |
https://doi.org/10.5194/acp-13-6263-2013 https://doaj.org/article/6580e08a26dd4403b332e1986dd01ac7 |
geographic |
Kiruna |
geographic_facet |
Kiruna |
genre |
Kiruna |
genre_facet |
Kiruna |
op_source |
Atmospheric Chemistry and Physics, Vol 13, Iss 13, Pp 6263-6274 (2013) |
op_relation |
http://www.atmos-chem-phys.net/13/6263/2013/acp-13-6263-2013.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-13-6263-2013 1680-7316 1680-7324 https://doaj.org/article/6580e08a26dd4403b332e1986dd01ac7 |
op_doi |
https://doi.org/10.5194/acp-13-6263-2013 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
13 |
container_issue |
13 |
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6263 |
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6274 |
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